Cement.



PATENTBD 001'. so, 1906. B. NEUBURGER & K. WITZ.

GE MEN T. APPLICATION FILED JULY28.1906.

M 4m W W. m

' WITNESSES.

' adding magn vment of the typ not merely in a'superficial manner,

UNITED STATES PATENT OF ICE,

BERNHARD, NEUBURGER AND KONRAD WITZ, OF NUR MBFJRG, GERMANY;

SAID WITZ ASSIGNOR TO SAID NEUBURGER.

CEMENT.-

Patented Oct. 30,1906.

Application filed July 28,1906. Serial Ho. 328,265.

To all whom it mdy concern:

Be it known that we, BERNHARD NlilUBUR- ments in Cements, of which thefollowing is a specification. This invention relates to the manufactureof cements, and particularly to a method of making an im rovedWeatherproof cement. Heretofore 1n the art a weatherproof ca' by addinghydrochloric acid 7 to magnesite, thereby obtainin a solution of chloridof magnesium and a ding magnesia thereto.

According to the resent invention hydrochloric acid is added tomagnesite and to the solution of magnesium chlorid thus obtainedcarbonic-acid .gas is added until the solution is saturated. In this wayby subsequently esia carbonate of magnesium can be obtained. This methodis of articular im ortance, for the reason that t e solution 0 chloridof magnesium being saturatedwith carbonic-acid gas the. magnesia uponbeing added to the said solution is-actedbupon ut a thorough chemicalreaction is effected, whereby a cement of superior quality is obtained.y

In the practice of this invention the apparatus illustrated in theaccompanying drawing may be advantageously employe e known assorel-cementi has been obtained free from sodium salts.

In the vessel 0 magnesite is caused to react with h drochloric acld, thelatterbein taken from t e vessel b. The carbonic acid liberated b thereaction is conducted into the rece tac e d, which contains a solutionof chlori of ma esium'. The solution of chlorid of magnesium which isproduced in the vessel a is passed into thereceptacle c and this isex'chan ed for the vessel (1 when the latter is em tie.

y means of the solution of chlorid of magin the rece tacle d carbonateof magnesia is obtaine by the addition of magnesia, wherebya-weatherproof cement of superior quality is produced.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is- The process of producing weatherproof cementwhich consists in reacting upon magnesite with hydrochloric acid, addingcarbonic-acid gas to the liquidresidue until the latter is saturated andfinally adding magnesia to the saturated liquid, substantially asdescribed.

In testimony whereof we affix our signatures in presence of twowitnesses.

BERNHARD NEUBURGER. KONRAD WITZ.

Witnesses OSCAR, BOOK, Hammer: FIETH.

45 nesium saturated with carbonic acidpresent

